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Senior Principal Applied Scientist

Germany, Berlin · Job Posted May 28, 2026
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Job Responsibility

  • Lead the research and development of our real-time bidding and allocation algorithms, optimizing for long-term platform health, advertiser performance, and user relevance
  • Advance our Auction and Mechanism Design capabilities to ensure a fair, efficient, and transparent marketplace
  • Collaborate with Product Managers, Engineers, and Analysts to translate complex business constraints into mathematical objective functions
  • Drive the long-term scientific and execution roadmap for ZMS Ad Tech Bidding Optimization in collaboration with Engineers and ML Scientists and foster a culture of technical excellence
  • Mentor and grow senior level members of the team, acting as a force multiplier for our scientific community

Requirements

  • You have a PhD in Machine learning with a track record of publications and industry experience
  • A proven track record of research excellence, evidenced by peer-reviewed publications in relevant fields such as Computational Advertising, Auction Theory, Mechanism Design, or Game Theory (please include these in your application) and/or equivalent applied industry impact track
  • At least 10+ years of experience (commensurate with Principal level) in optimizing complex systems through automated algorithms, specifically within Ad Tech, Marketplaces, or related fields
  • Deep theoretical and technical expertise in optimization, control theory, or reinforcement learning applied to bidding and budget pacing
  • Expert knowledge of productionalizing ML models within ultra-low latency constraints and experience with large-scale distributed systems
  • Strong proficiency in Python and related stack, with a solid understanding of how to architect scalable data pipelines for sparse, high-dimensional advertising data

What we offer

  • 27 days of holiday a year to start for full-time employees (+1 day for every calendar year up to 30 days)
  • 2 paid volunteering days a year
  • Hybrid working model with up to 60% remote per week, actual practice is up to each team to best support their collaboration
  • Work from abroad for up to 30 working days a year
  • Employee shares program
  • 40% off fashion and beauty products sold and shipped by Zalando, 30% off Lounge by Zalando, discounts from external partners
  • Relocation assistance available (subject to prior agreement)
  • Family services, including counseling and support
  • Health and wellbeing options (including Wellhub, formerly Gympass)
  • Mental health support and coaching available
  • Drive your development through our training platform and biannual peer-to-peer review

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